[Asterisk-Users] Hangup FXO line detecting & PSTN Tone Signals Detecting

[Miroslav Nachev]

Hi,

The national PSTN is built up by a Siemens & Eriksson digital PBX
which, in most cases, ends up in analogue interfaces with tone
dialing. It proved a hard job for me to find the most important tone
signals and information messages going out of the PSTN. However, I
don’t know where and how to use (position) them. What I have
identified so far, is as follows:
   * Dial Tone;
   * Busy (engaged) line;
   * Congestion;
   * Hook off tone;
   * Ring tone;
   * Interference Tone;
   * Info signal;
   * Warning Tone;
   * Special Dial Tone;
   * Alarm tone;
   * Hold on tone;
   * Call waiting.

What I need to know is how and where I can enter this information to
make Asterisk identify messages and respond in a proper way. 

The biggest trouble occurs when the other end caller hangs up (from
the PSTN part).
Asterisk cannot recognize that the line is broken because our FXO port
frequently gets blocked. This can be done through the tones coming
from the PTSN, which in this case, are:   
   Frequency             : 425 Hz
   Level                 : 10 dBm0
   Signal (ms)/Pause (ms): 320, 320
   Max. Duration         : 30 s
  

-- 
Best Regards,
Miroslav Nachev

COSMOS Software Enterprises, Ltd.
Tel:    (+359-2)   983-32-62
Mobile: (+359-88)  897-31-95
E-Mail: m_natchev at yahoo.com
        miro at space-comm.com
http://www.space-comm.com

Post address:
   P. O. Box 941,
   1000 Sofia,
   Bulgaria

Office address:
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   1202 Sofia,
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